DFPLAYER PRO Memory chip replacement

Hi,

There is a MKDV1GIL-AS memory chip on the board from the factory. The documentation says that 128MB of memory is available for the user, but if I understand the labeling correctly, then 1Gb should be available. Is it so?

If I want to increase the memory, can I replace the chip with MKDV4GCL-AB? 

Will this be of any use, or is 128Mb the maximum regardless of the chip?

Thanks